OFFSET
1,1
COMMENTS
The numbers can be constructed from the standard prime factorization n = Product (q_k^e_k), including a factor with q=1, then a(n) = Sum (q_k + e_k).
EXAMPLE
For n=10=1^1*2^1*5^1 the a(10)=1+1+2+1+5+1=11.
CROSSREFS
KEYWORD
nonn,less
AUTHOR
Jaroslav Krizek, Apr 04 2009
EXTENSIONS
Edited by R. J. Mathar, Apr 06 2009
STATUS
approved